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Simplifying (4a + -6) + -1(a + 3) = 0 Reorder the terms: (-6 + 4a) + -1(a + 3) = 0 Remove parenthesis around (-6 + 4a) -6 + 4a + -1(a + 3) = 0 Reorder the terms: -6 + 4a + -1(3 + a) = 0 -6 + 4a + (3 * -1 + a * -1) = 0 -6 + 4a + (-3 + -1a) = 0 Reorder the terms: -6 + -3 + 4a + -1a = 0 Combine like terms: -6 + -3 = -9 -9 + 4a + -1a = 0 Combine like terms: 4a + -1a = 3a -9 + 3a = 0 Solving -9 + 3a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 3a = 0 + 9 Combine like terms: -9 + 9 = 0 0 + 3a = 0 + 9 3a = 0 + 9 Combine like terms: 0 + 9 = 9 3a = 9 Divide each side by '3'. a = 3 Simplifying a = 3
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